@book { DasBusinessGedchtnistraining,
    title = "Das Business-Gedächtnistraining",
    author = "Stefanie {Schneider} and Petra {Hitzig}",
    year = "2012",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403362"
}